backend.txt

Backend			Frontend

Mailbox (changed)

Emails			v2r (user sorted)
	[.] --> E		3
	[.] --> E		4
	[.] --> E		1
	[.] --> E		2

E(changed) -> Env


Mailbox observes *itself* to see E changes?!


Function
--------

f(E) -> E'	<toggle-new>
	notify(E, flags)  Changed 'X'
	need flags ∀ changes
	=> Mailbox

M observes M
	notify(M, flags)  Changed 'Y'
	relay relevant to M


Gui observes M
	Decides if resort is nec (flags View *resort*)
	Flags Window RECALC
	Single E update -> RECALC (flag View *paint*single*)


Gui recalc
	sort? save current E, sort, restore selection => REPAINT
	single? find E, recalc E => REPAINT

other GUIs: Ibar, PBar, Sidebar